Fast mobile shaders or rather Mobile! Fast!

Recommendations

Info

FXAA2 Initial•32.1ms iPad2, 65.5ms 3Gs, 30.4msXperiaPlay•Use PVRUniSCo• It likes to crash a lot•When it does, keep on tweaking shader,sometimes that makes crash go away...Yep, way too expensive!Use PVRUniSCo to tweak the shader, however current version likes to crash on it a lot :(
Fail #1•FXAA is all float/highp• Let’s use lower precision where can!•Much slower :(• WTF?!• Maybe conversions cost?• No idea.Many attempted optimization steps weren’t successful. Using “general intuition”, tried t<strong>or</strong>eplace all col<strong>or</strong>s with lowp - much slower! Why - no idea.
Page 1 and 2:
Fast mobile shadersor ratherMobile!
Page 3 and 4:
Outline• Desktop vs. Mobile• GP
Page 5 and 6:
Mobile•••Needs to use 100x le
Page 7 and 8:
Old Is New•Techniques from 2001 i
Page 9 and 10:
Workload••Frequency of computat
Page 11 and 12:
Scene•••Opaque is the bestAvo
Page 13 and 14:
“Onload” CPU?••More fast co
Page 15 and 16:
GPU Species••••ImgTec Power
Page 17 and 18:
Architectures•Tiled Deferred• P
Page 19 and 20:
Case: HSR Performance•0.8-3.5ms t
Page 21 and 22:
Hidden Surface Removal•Simple geo
Page 23 and 24:
Saving BW & ALU•Framebuffer write
Page 25 and 26:
Tiled Framebuffers•Higher Z preci
Page 27 and 28:
Case: MSAA•4xMSAA, iPad2• 6ms i
Page 29 and 30:
Case: Mipmaps•••Turn off mipm
Page 31 and 32:
Case: OptimizingSHADOWGUN forTegra
Page 33 and 34:
SHADOWGUN+Tegra2••Target 30 FPS
Page 35 and 36:
Sort opaque geometry!•Saved ~15ms
Page 37 and 38:
LUT Baking ToolsAnother bonus: sinc
Page 39 and 40:
Texture Compression•••Tegra h
Page 41 and 42:
Profiling toolsTools
Page 43 and 44:
PVRUniSCoPVRUniSCo gives cycles for
Page 45 and 46:
PerfHUD ES
Page 47 and 48:
Tools: Android + Adreno•Adreno Pr
Page 49 and 50:
Shader Performance
Page 51 and 52:
GLSL ES specific•Precision qualif
Page 53 and 54: General Intuition•••Note: Han
Page 55 and 56: Precision: half / mediump••16 b
Page 57 and 58: Precision•Minimize conversion bet
Page 59 and 60: Shader Performance•Some shaders
Page 61 and 62: Shader Performance••Normalized
Page 63 and 64: Relative Performance•All lines in
Page 65 and 66: Unannouced TitleHigh poly, lots of
Page 67 and 68: Current state••37FPS after opti
Page 69 and 70: Getting GPU time on iOS•Force CPU
Page 71 and 72: Post-processing•Precision: lowp/f
Page 73 and 74: Burning Walls shader
Page 75 and 76: Burning Walls shader•Saved ~8ms p
Page 77 and 78: Optimize Particles•Reduce overdra
Page 79 and 80: Case: AngryBots
Page 81 and 82: AngryBots••Not much optimizatio
Page 83 and 84: Added for PC•••Depth of Field
Page 85 and 86: Wet floor•Render subset of scene
Page 87 and 88: Planar reflection
Page 89 and 90: Albedo
Page 91 and 92: Gloss (A of albedo tex)
Page 93 and 94: Pixel shader
Page 95 and 96: Splashes: geom + atlasWater splashe
Page 97 and 98: Post-fx costs••At native device
Page 99 and 100: Combine post-fx•Color Correction
Page 101 and 102: Cheat a bit•Scratch texture on no
Page 103: FXAA•Fast Approximate AA• Post
Page 107 and 108: Win #1•Use more (5) vec2 varyings
Page 109 and 110: FXAA 3.11•Latest FXAA 3.1 “cons
Page 111 and 112: Optimizing FXAA 3.11•Down to 12.7
Page 113 and 114: Extra SlidesExtra stuff we had init
Page 115 and 116: “Proper way”•Bake a bunch of
Page 117 and 118: Actually reflectedThis is what is a
Page 119 and 120: Ta-da!
Page 121 and 122: Reflection UVs••Not much physic
Page 123 and 124: Without Bloom
Page 125 and 126: Also Color Adj•Can also do simple
Page 127 and 128: “Mood Boxes” in Unity 3.4 Angry
Page 129: Mood Boxes•When entering new mood
show all

Fast mobile shaders or rather Mobile! Fast!

Create successful ePaper yourself

Delete template?

Save as template?